Lex
Lex is an innovative word processing tool meant to enhance the writing experience, offering a variety of innovative features. It is designed to assist with all ...
Last verified:
What is Lex?
Lex is an AI-powered word processor designed for modern creators who want to write faster, clearer, and smarter. It combines collaborative document editing with powerful AI editing tools baked directly into the writing experience. The tool enables users to effortlessly generate content, refine ideas, and elevate their writing flow through inline AI assistance rather than replacing the writer entirely.
Key features include AI Chat for discussing your writing with chosen AI models, AI Checks for line-level suggestions highlighted in your document, Style Guides to train Lex to draft and edit in your voice, and Knowledge Bases that give your AI assistant persistent background knowledge. Lex also offers robust version control with Rewind (scrub through and restore previous versions) and manual named Versions, live collaboration where multiple people can edit simultaneously, mobile web access without app downloads, publishing with read-only links, AI Feedback for brainstorming and rewriting, Commands for handy AI shortcuts, and Title Ideas generation with one click.
Lex is ideal for writers who go through an edit process and need high-quality output, including academics writing papers, marketers creating customer-facing copy, newsletter writers, fiction authors, YouTubers scripting videos, and teams collaborating on documents. It's loved by over 300,000 writers and serves as a Google Docs replacement with superior AI capabilities. The platform supports various writing types from quick notes to complex documents.
Lex pricing
Pricing model: Freemium
Lex offers a Free tier with basic AI model access, collaborative document editing, mobile web access, and limited AI usage (Ask Lex messages, Checks, and custom prompts). Lex Pro costs $18/month or $144/year billed annually ($12/month equivalent). Pro includes access to the biggest and best AI models (GPT-4o, Claude 3.5 Sonnet, GPT 4.1, Claude 4 Opus & Sonnet), unlimited AI usage, custom AI training and Style Guides, early access to new features like the iOS app, and priority support via Discord. Lex Teams is available for organizations needing extensive team collaboration with unlimited group use of folders. Discounts are offered for nonprofit organizations, students, and academics (contact [email protected]). It is totally free to share and collaborate on Lex documents.
Lex pros
- AI writes with you, not for you - collaborative co-pilot approach
- Minimalist interface that helps you focus on writing
- Live collaboration with one-click login, no app download required
- Choose from multiple AI models including GPT-4o and Claude 3.5 Sonnet
- Style Guides train Lex to draft and edit in your unique voice
- Knowledge Bases provide persistent background knowledge for personalized help
- Prompt Library with expert user-contributed prompts for academic papers to YouTube scripts
- Version control with Rewind to restore previous versions and named save points
- Line-level AI Checks highlighted directly in your document
- Mobile web access lets you write from anywhere without installing an app
- Publishing feature sends read-only links for easy sharing
- One-click Title Ideas generation from AI
- Keyboard shortcuts for navigation and productivity
- Enterprise APIs ensure your content isn't used to train AI models
- Custom saved prompts and Prompt Builder for specific writing challenges
- Free tier includes basic AI support and collaboration features
- API available for developers with simple documentation
- Discounts available for nonprofits, students, and academics
Lex cons
- Free tier has limited Ask Lex messages, Checks, and custom prompts
- Premium AI models like GPT-4o and Claude 3.5 Sonnet require Pro plan
- Track Changes feature still coming soon, not yet available
- iOS app only available to Pro members as early access
- AI usage limits on free accounts compared to unlimited on Pro
- $18/month Pro pricing may be expensive for casual writers
- Priority support via Discord only for Pro members
- Primarily web-based, limited native desktop app functionality
Frequently asked questions about Lex
What is Lex and what makes it different from other writing tools?
Lex is a modern AI-powered word processor designed for modern creators that enables a radically new way to write. Unlike other tools, Lex building AI that writes with you, not for you. It combines collaborative documents with powerful AI editing tools baked directly into the writing experience, featuring inline Ask Lex comments, line-level Checks, and a minimalist interface that helps you focus while the AI serves as a real-time editor.
What AI models can I use in Lex?
Free users get access to basic AI models. Pro members ($18/month) can access the biggest and best AI models including GPT-4o, Claude 3.5 Sonnet, GPT 4.1, and Claude 4 Opus & Sonnet. Premium models offer drastically higher intelligence, reasoning capabilities, better responsiveness to detailed instructions, and improved handling of large quantities of information. You can choose which model to use when chatting with your writing.
Is my writing being used to train the AI?
No, Lex does not train language models and has no immediate plans to do so. Lex uses enterprise APIs from OpenAI, Anthropic, and TogetherAI, which offer stronger privacy protections. All data on Lex is privately and securely hosted on their own database with strict access policies, and explicit permission is always asked for team access.
What are the AI limits for free users?
Free accounts have limited Ask Lex messages, Checks (line-level suggestions), and custom prompts. The free tier includes basic AI model access and collaborative document editing, but Pro members get unlimited AI usage and much higher AI usage limits. The exact daily caps aren't specified on the website, but free users will hit limits significantly sooner than Pro users.
Can I use Lex with my team?
Yes, sharing and collaborating on Lex documents is completely free. You can share a link, login with one click, and instantly see what each other is typing with live collaboration. You can also share prompts, context tags, and folders. For extensive team collaboration with unlimited group use of folders, you can add Lex Teams to your subscription for organizational pricing.
What kind of writing is Lex designed for?
Lex is designed for any writing that goes through an edit process and needs to be high quality. This includes academic papers, customer-facing copy, important emails, fiction writing, newsletters, YouTube scripts, and complex documents. From quick notes to complex documents, Lex nails the details. It's particularly suited for writers who need AI feedback, brainstorming help, and rewriting assistance.
How does the version control work in Lex?
Lex offers two version control features: Rewind lets you scrub through and restore previous versions of your document, while Versions allows you to create manual, named save points as you go. This means you can try a different way of saying something without losing what you've got, giving you the freedom to experiment with your writing.
What is the Prompt Library and how do I use it?
The Prompt Library is a collection of expert user-contributed prompts for every kind of writing, from academic papers to YouTube scripts. You can browse this collection to find prompts tailored to your specific writing needs. Pro users can also access Default Saved Prompts pre-populated in Ask Lex, and use the Prompt Builder Guide to create their own custom prompts and checks for specific writing challenges.
Do you offer refunds if I'm not satisfied?
Yes, if you are not satisfied with Lex after a month, you can reach out to [email protected] for a refund. This refund policy applies to Pro subscriptions, giving you time to test whether the tool works for your writing workflow.
How does Lex support work and how can I get help?
Pro members get priority support via Discord. All members of the Lex community are encouraged to reach out to [email protected] with questions or feedback. You can also attend Lex 101 sessions, which drop-in sessions for new users looking to get started, power users optimizing their workflow, or anyone with questions and feedback. There's also an intro video available for quick start guidance.